package com.itfs.jdbc;

import java.io.IOException;
import java.io.InputStream;
import java.sql.*;
import java.util.Properties;

public class JdbcUtils {

    private static String driver = null;
    private static String url = null;
    private static String username = null;
    private static String password = null;

    static{
        try {
            InputStream in = JdbcUtils.class.getClassLoader().getResourceAsStream("db.properties");
            Properties properties = new Properties();
            properties.load(in);

            properties.getProperty("driver");
            properties.getProperty("url");
            properties.getProperty("username");
            properties.getProperty("password");

            //获取加载驱动-- 驱动只用加载一次
            Class.forName(driver);

        } catch (Exception e) {

        }

    }

    //获取链接
    public static Connection getConection() throws SQLException {
        return DriverManager.getConnection(url,username,password);

    }


    //释放连接资源
    public static void release(Connection conn, Statement st, ResultSet rs){
        if (rs != null){
            try {
                rs.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if (st != null){
            try {
                st.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }
        if (conn != null){
            try {
                conn.close();
            } catch (SQLException throwables) {
                throwables.printStackTrace();
            }
        }

    }






}
